Spirit Airlines is launching three new year-round routes from Louis Armstrong New Orleans International Airport in May, upon the start of its summer schedule, and in April it will begin operating a new year-round service from Houston’s George Bush Intercontinental Airport.

Southwest Airlines is planning to launch service on June 4 to Cincinnati/Northern Kentucky International Airport and to Grand Cayman’s Owen Roberts International Airport (subject to Southwest receiving requisite governmental approvals).

Assuming it receives the required governmental approvals, Alaska Airlines will operate four weekly round-trips from Los Angeles to Costa Rica’s capital San Jose and also four round-trips to Liberia in Guanacaste province.

JetBlue Airways has announced its new twice-daily service between Baltimore/Washington Thurgood Marshall International Airport and Fort Lauderdale Hollywood International Airport will begin on November 12.

JetBlue Airways intends to expand its presence at Baltimore/Washington Thurgood Marshall International Airport in November, when it launches twice-daily service linking the Maryland airport with Fort Lauderdale Hollywood International Airport.

The airline’s 2015 service expansion from Hartsfield-Jackson Atlanta International Airport begins on May 7, when Spirit launches services from ATL to Cleveland, Las Vegas, and Orlando. Its service expansion from Los Angeles takes place on July 9, with new routes to Baltimore and Kansas City.

In a new extension of its flight schedule to August 7, Southwest Airlines has added seven new year-round U.S. domestic routes, along with 18 additional domestic seasonal and two international services for summer 2015.

Spirit Airlines plans to launch service from Houston Bush Intercontinental Airport to 10 new destinations in the spring of 2015, three of them in the U.S. and the rest in Mexico and Central America. New U.S. destinations are the Tampa, Baltimore/Washington International and Oakland airports.

Southwest Airlines will expand its fledgling international-service network by offering new flights to both the Pacific and Caribbean coasts of Mexico from August 10 and early October, as well as launching other new international services.

Southwest Airlines will launch new non-stop service to 15 new domestic destinations from Dallas Love Field following the repeal of flight restrictions imposed in 1979 which limit the states that can be served from the near-downtown airport.

In its new schedule extension through June 2014, Southwest Airlines is adding new routes from Portland in Oregon and San Diego, and is increasing its services in existing markets from New York LaGuardia.

In extending its bookable flight schedules for travel through March 7, 2014, Southwest Airlines has revealed it is introducing new service between Hartsfield-Jackson Atlanta International Airport and Ronald Reagan Washington National Airport on February 13.

Southwest Airlines is launching service to Memphis, Pensacola, and Richmond in Virginia on November 3. Both Southwest Airlines and subsidiary AirTran Airways have newly extended their schedules through until New Year’s weekend and the two airlines are launching a sizable number of new year-round and seasonal services.